Research On Indoor And Outdoor Seamless Positioning Methods Based On 5G

In recent years,various intelligent devices emerge in endlessly,and the demand for location services in all walks of life is increasing yearly.At present,outdoor positioning technology has been quite mature,but there is no indoor positioning technology that can be widely used.With the development of 5G positioning technology,this situation is expected to change.Seamless positioning technology is a research hotspot in recent years,and its purpose is to integrate multiple positioning technologies in multiple environments to provide positioning terminals with full coverage services in the entire positioning area.For indoor and outdoor boundary areas and indoor areas,map information is an important positioning resource.Its effective use can avoid the phenomenon of trajectory through the wall.The main work of this paper are as follows:Firstly,in view of the problem that a single mode cannot be independently positioned due to the limited number of visible satellites or 5G base stations in the indoor and outdoor junction,a 5G/GNSS fusion positioning algorithm combined with map information is proposed.The algorithm uses the least squares method to fuse the 5G ranging value and the satellite pseudorange to obtain the preliminary positioning result.On this basis,the particle filter is used for further processing,updates the particle state according to the preliminary positioning results,updates the weight according to whether the two adjacent states of the particle pass through the wall,and takes the result of particle filter as the final positioning result,so as to advance the rationality and smoothness of the positioning trajectory in the continuous positioning process,and elevate the positioning accuracy and the coverage of location service.Secondly,a indoor and outdoor seamless positioning algorithm based on 5G is proposed,the judgment method of the positioning area and the switching strategy between different positioning areas are designed,and the switching threshold is introduced to suppress the ping-pong effect of the indoor and outdoor integrated positioning scene.The algorithm divides the whole positioning area into outdoor,indoor and outdoor junction and indoor areas.The indoor area uses a 5G TDOA positioning algorithm combined with map information to avoid trajectories through walls.On this basis,the positioning area is judged and the positioning algorithm is switched according to the number and quality of signals received by the terminal from satellites and 5G base stations,finally realize the seamless indoor and outdoor positioning effect and eliminate the positioning blind area.Finally,the experimental results show that compared with the preliminary positioning results,the positioning results of the 5G/GNSS fusion positioning algorithm combined with map information have significantly improved the smoothness and rationality of the positioning trajectory,as well as the accuracy of positioning.The indoor and outdoor seamless positioning algorithm based on 5G can smoothly switch between different positioning algorithms,the stability,continuity,and availability of the positioning are all performed well,and the The continuous,full coverage and highly available location service in the whole positioning area is realized.